pyth作业3/25

1、文件内容如下,标题为:姓名,性别,年纪,薪资
egon male 18 3000
alex male 38 30000
wupeiqi female 28 20000
yuanhao female 28 10000

要求:
从文件中取出每一条记录放入列表中,
列表的每个元素都是{'name':'egon','sex':'male','age':18,'salary':3000}的形式

with open("file.txt","r",encoding="utf-8") as f:
    l=[]
    for line in f:
        name,sex,age,salary=line.strip("
").split()
        l.append({"name":name,"sex":sex,"age":age,"salary":salary})
print(l)

2 根据1得到的列表,取出所有人的薪资之和

with open("file.txt","r",encoding="utf-8") as f:

    l=[]
    for line in f:
        name,sex,age,salary=line.strip("
").split()
        l.append({"name":name,"sex":sex,"age":age,"salary":salary})

sum_salary=sum(int(i["salary"]) for i in l)
print(sum_salary)

3 根据1得到的列表,取出所有的男人的名字

with open("file.txt","r",encoding="utf-8") as f:

    l=[]
    for line in f:
        name,sex,age,salary=line.strip("
").split()
        l.append({"name":name,"sex":sex,"age":age,"salary":salary})

new_l=[i["name"] for i in l if i["sex"]=="male"]
print(new_l)

4 根据1得到的列表,将每个人的信息中的名字映射成首字母大写的形式

with open("file.txt","r",encoding="utf-8") as f:

    l=[]
    for line in f:
        name,sex,age,salary=line.strip("
").split()
        l.append({"name":name,"sex":sex,"age":age,"salary":salary})

name_l=[i["name"].capitalize() for i in l]
print(name_l)

5 根据1得到的列表,过滤掉名字以a开头的人的信息

with open("file.txt","r",encoding="utf-8") as f:

    l=[]
    for line in f:
        name,sex,age,salary=line.strip("
").split()
        l.append({"name":name,"sex":sex,"age":age,"salary":salary})

name_l=[i["name"] for i in l if not i["name"].startswith("a")]
print(name_l)

6 使用递归打印斐波那契数列(前两个数的和得到第三个数，如：0 1 1 2 3 4 7...)

def p_fibonacci(n,a=0,b=1):
    while n > 0:
        print(a,end=" ")
        a,b=b,a+b
        n-=1
        return p_fibonacci(n,a,b)

p_fibonacci(6)

7 一个嵌套很多层的列表，如l=［1,2,[3,[4,5,6,[7,8,[9,10,[11,12,13,[14,15]]]]]]］，用递归取出所有的值

l=[1,2,[3,[4,5,6,[7,8,[9,10,[11,12,13,[14,15]]]]]]]
def p(x):
    for i in x:
        if type(i) is list:
            p(i)
        else:
            print(i,end=" ")
p(l)